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A Critical Review of the Research on the Extreme Male Brain Theory and Digit Ratio (2D:4D) / Missy L. TEATERO in Journal of Autism and Developmental Disorders, 43-11 (November 2013)
[article]
Titre : A Critical Review of the Research on the Extreme Male Brain Theory and Digit Ratio (2D:4D) Type de document : Texte imprimé et/ou numérique Auteurs : Missy L. TEATERO, Auteur ; Charles NETLEY, Auteur Article en page(s) : p.2664-2676 Langues : Anglais (eng) Mots-clés : Extreme male brain Autism spectrum Empathizing Systemizing Digit ratio 2D:4D Index. décimale : PER Périodiques Résumé : Boys are more likely than girls to be diagnosed with an autism spectrum disorder (ASD). The extreme male brain (EMB) theory of ASD suggests that fetal testosterone (FT) exposure may underlie sex differences in autistic traits. A link between the organizational effects of FT on the brain and ASD is often drawn based on research using digit ratio (2D:4D), a putative biomarker, without a full survey of the findings. This paper critically and quantitatively reviews the research on the relationship between 2D:4D and ASD as well as autism spectrum, empathizing, and systemizing measures in neurotypical populations. Overall, there is some support for the EMB theory in all four areas, particularly the 2D:4D–ASD relationship. Recommendations for future research are provided. En ligne : http://dx.doi.org/10.1007/s10803-013-1819-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=217
in Journal of Autism and Developmental Disorders > 43-11 (November 2013) . - p.2664-2676[article] A Critical Review of the Research on the Extreme Male Brain Theory and Digit Ratio (2D:4D) [Texte imprimé et/ou numérique] / Missy L. TEATERO, Auteur ; Charles NETLEY, Auteur . - p.2664-2676.
Langues : Anglais (eng)
in Journal of Autism and Developmental Disorders > 43-11 (November 2013) . - p.2664-2676
Mots-clés : Extreme male brain Autism spectrum Empathizing Systemizing Digit ratio 2D:4D Index. décimale : PER Périodiques Résumé : Boys are more likely than girls to be diagnosed with an autism spectrum disorder (ASD). The extreme male brain (EMB) theory of ASD suggests that fetal testosterone (FT) exposure may underlie sex differences in autistic traits. A link between the organizational effects of FT on the brain and ASD is often drawn based on research using digit ratio (2D:4D), a putative biomarker, without a full survey of the findings. This paper critically and quantitatively reviews the research on the relationship between 2D:4D and ASD as well as autism spectrum, empathizing, and systemizing measures in neurotypical populations. Overall, there is some support for the EMB theory in all four areas, particularly the 2D:4D–ASD relationship. Recommendations for future research are provided. En ligne : http://dx.doi.org/10.1007/s10803-013-1819-6 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=217 Testing the Extreme Male Brain Theory of Autism Spectrum Disorder in a Familial Design / Ingeborg HAUTH in Autism Research, 7-4 (August 2014)
[article]
Titre : Testing the Extreme Male Brain Theory of Autism Spectrum Disorder in a Familial Design Type de document : Texte imprimé et/ou numérique Auteurs : Ingeborg HAUTH, Auteur ; Yvette G. E. DE BRUIJN, Auteur ; Wouter STAAL, Auteur ; Jan K. BUITELAAR, Auteur ; Nanda N. ROMMELSE, Auteur Année de publication : 2014 Article en page(s) : p.491-500 Langues : Anglais (eng) Mots-clés : autism spectrum disorder extreme male brain theory testosterone 2D:4D finger length siblings parents empathizing systemizing Index. décimale : PER Périodiques Résumé : Autism Spectrum Disorder (ASD) may be an extreme manifestation of some male-typical traits in both neuroanatomy and cognition. Using the ratio of the second to fourth digit (2D:4D) and digit length as biomarkers of (pre- and postnatal) testosterone levels, examined was whether hypermasculinized digit ratios and/or lengths were familial traits in ASD and investigated their relation to sexually dimorphic cognitive abilities. 2D:4D ratios and digit lengths of 216 children with ASD, 202 unaffected siblings, and 360 parents were compared with those of 174 control children and their 146 parents. Generalized Estimation Equations, Generalized Linear Models, and Linear Mixed Models were used to investigate parent–offspring relationships and group differences. In ASD probands and their relatives alike, digit length relative to overall height was significantly increased in comparison to controls. No significant group differences were found between affected and unaffected subjects, or between males and females. Additionally, 2D:4D ratios increased with age. No (consistent) associations were found between 2D:4D ratio or digit lengths and systemizing and empathizing skills. The findings emphasize the role of familially based elevated pre- and postnatal testosterone levels in the liability for ASD, but challenge the use of 2D:4D ratio as a proxy of prenatal testosterone exposure solely. Given that many genes influence digit length, the exact mechanisms underlying a familial predisposition toward increased digit length in ASD are as yet unknown and needs to be explored in future studies. En ligne : http://dx.doi.org/10.1002/aur.1384 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=238
in Autism Research > 7-4 (August 2014) . - p.491-500[article] Testing the Extreme Male Brain Theory of Autism Spectrum Disorder in a Familial Design [Texte imprimé et/ou numérique] / Ingeborg HAUTH, Auteur ; Yvette G. E. DE BRUIJN, Auteur ; Wouter STAAL, Auteur ; Jan K. BUITELAAR, Auteur ; Nanda N. ROMMELSE, Auteur . - 2014 . - p.491-500.
Langues : Anglais (eng)
in Autism Research > 7-4 (August 2014) . - p.491-500
Mots-clés : autism spectrum disorder extreme male brain theory testosterone 2D:4D finger length siblings parents empathizing systemizing Index. décimale : PER Périodiques Résumé : Autism Spectrum Disorder (ASD) may be an extreme manifestation of some male-typical traits in both neuroanatomy and cognition. Using the ratio of the second to fourth digit (2D:4D) and digit length as biomarkers of (pre- and postnatal) testosterone levels, examined was whether hypermasculinized digit ratios and/or lengths were familial traits in ASD and investigated their relation to sexually dimorphic cognitive abilities. 2D:4D ratios and digit lengths of 216 children with ASD, 202 unaffected siblings, and 360 parents were compared with those of 174 control children and their 146 parents. Generalized Estimation Equations, Generalized Linear Models, and Linear Mixed Models were used to investigate parent–offspring relationships and group differences. In ASD probands and their relatives alike, digit length relative to overall height was significantly increased in comparison to controls. No significant group differences were found between affected and unaffected subjects, or between males and females. Additionally, 2D:4D ratios increased with age. No (consistent) associations were found between 2D:4D ratio or digit lengths and systemizing and empathizing skills. The findings emphasize the role of familially based elevated pre- and postnatal testosterone levels in the liability for ASD, but challenge the use of 2D:4D ratio as a proxy of prenatal testosterone exposure solely. Given that many genes influence digit length, the exact mechanisms underlying a familial predisposition toward increased digit length in ASD are as yet unknown and needs to be explored in future studies. En ligne : http://dx.doi.org/10.1002/aur.1384 Permalink : https://www.cra-rhone-alpes.org/cid/opac_css/index.php?lvl=notice_display&id=238